|Publication number||US8014745 B1|
|Application number||US 12/389,610|
|Publication date||Sep 6, 2011|
|Filing date||Feb 20, 2009|
|Priority date||Feb 20, 2009|
|Publication number||12389610, 389610, US 8014745 B1, US 8014745B1, US-B1-8014745, US8014745 B1, US8014745B1|
|Inventors||Thinh Q. Ho, Stephen M. Hart|
|Original Assignee||The United States Of America As Represented By The Secretary Of The Navy|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (12), Referenced by (7), Classifications (6), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention (Navy Case No. 79847) was developed with funds from the United States Department of the Navy. Licensing inquiries may be directed to Office of Research and Technical Applications, Space and Naval Warfare Systems Center, San Diego, Code 2112, San Diego, Calif., 92152; telephone 619-553-2778; email: T2@spawar.navy.mil.
This disclosure relates to methods and systems for improving noise-isolation/cross coupling of communication systems.
The conventional approach for achieving multiple communications functions is to use different antennas with each antenna providing for one function. In such a configuration, these antennas should be spaced far enough apart physically so that electromagnetic isolation between systems may be achieved by the virtue of the spatial distance.
Unfortunately, this approach may not be available in small environments, such as aircraft and ships, where space is limited and a large variety of functions are necessary for efficient operation. Accordingly, new technology related to the integration of communication systems is desirable.
Various aspects and embodiments of the invention are described in further detail below.
In a first series of embodiments, a compensation apparatus for an integrated communication system is disclosed. The integrated communication system includes a first communication device having a first transmitter antenna, and a second communication device having a second receiver antenna, wherein the second receiver antenna is in appreciable proximity of the first transmitter antenna such that the second receiver antenna picks up substantial electromagnetic interference from the first communication device. The compensation apparatus includes an isolation device having compensation circuitry coupling the first transmitter antenna and the second receiver antenna and configured to adaptively cancel the electromagnetic interference from the first communication device at the second receiver antenna.
In yet another series of embodiments, a compensation apparatus for an integrated communication system is disclosed. The integrated communication system includes a first communication device having a first transmitter antenna, and a second communication device having a second receiver antenna, wherein the second receiver antenna is in appreciable proximity of the first transmitter antenna such that the second receiver antenna picks up substantial electromagnetic interference from the first communication device. The compensation apparatus includes an isolation means for adaptively canceling electromagnetic interference from the first communication device at the second receiver antenna, and a first coupler coupling the isolation means to the second receiver antenna.
The features and nature of the present disclosure will become more apparent from the detailed description set forth below when taken in conjunction with the accompanying drawings in which reference characters identify corresponding items.
The disclosed methods and systems below may be described generally, as well as in terms of specific examples and/or specific embodiments. For instances where references are made to detailed examples and/or embodiments, it should be appreciated that any of the underlying principles described are not to be limited to a single embodiment, but may be expanded for use with any of the other methods and systems described herein as will be understood by one of ordinary skill in the art unless otherwise stated specifically.
In operation, communication devices 130 and 140 may operate independently or interdependently, and may be located such that there may be electromagnetic interference between the two systems. For example, receiver antenna RX-1 may be in appreciable proximity of the transmitter antenna TX-2 such that receiver antenna RX-1 picks up substantial electromagnetic interference from the second communication device 140. Similarly, receiver antenna RX-2 may be in appreciable proximity of the transmitter antenna TX-1 such that receiver antenna RX-2 picks up substantial electromagnetic interference from the first communication device 130.
In order to compensate for this generally undesirable electromagnetic cross-coupling, the isolation apparatus 120 may be employed to actively cancel such interference. For example, using coupler C1, the isolation apparatus 120 may receive coupled signal 101 from transmitter antenna TX-1, then apply an appropriate phase and amplitude adjustment to produce compensation signal 103, which may be coupled into receiver antenna RX-2 via coupler C3. Assuming that the amplitude and phase are appropriately adjusted, the electromagnetic interference at receiver antenna RX-2 from transmitter antenna TX-1 may be minimized.
Similarly, using coupler C4, the isolation apparatus 120 may receive signal 104 from transmitter antenna TX-2, then apply an appropriate phase and amplitude adjustment to produce signal 102, which may be coupled into receiver antenna RX-1 via coupler C2. Again assuming that the amplitude and phase are appropriately adjusted, the electromagnetic interference at receiver antenna RX-1 from transmitter antenna TX-2 may be minimized.
Continuing, depending on the particular circumstances, it may be extremely difficult to form a compensated signal from a transmitted signal having a broad frequency spectrum, especially given that “free-air” coupling between a transmitter and a closely located receiver may be highly frequency dependent. In such cases, the configuration of the second exemplary isolation apparatus 320 may be useful to produce a single compensated signal by allowing the separate compensation circuits AMP/PHASE F1. AMP/PHASE F5 to separately process the different frequency ranges F1 . . . F5 as may be appropriate.
In various embodiments where the above-described systems and/or methods may be implemented using a programmable device, such as a computer-based system or programmable logic, it should be appreciated that the above-described systems and methods can be implemented using any of various known or later developed programming languages, such as “C”, “C++”, “FORTRAN”, “Pascal”, “VHDL” and the like.
Accordingly, various storage media, such as magnetic computer disks, optical disks, electronic memories and the like, can be prepared that can contain information that can direct a device, such as a computer, to implement the above-described systems and/or methods. Once an appropriate device has access to the information and programs contained on the storage media, the storage media can provide the information and programs to the device, thus enabling the device to perform the above-described systems and/or methods.
For example, if a computer disk containing appropriate materials, such as a source file, an object file, an executable file or the like, were provided to a computer, the computer could receive the information, appropriately configure itself and perform the functions of the various systems and methods outlined in the diagrams and flowcharts above to implement the various functions. That is, the computer could receive various portions of information from the disk relating to different elements of the above-described systems and/or methods, implement the individual systems and/or methods and coordinate the functions of the individual systems and/or methods related to communications.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations that fall within the spirit and scope of the appended claims. Furthermore, to the extent that the term “includes” is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term “comprising” as “comprising” is interpreted when employed as a transitional word in a claim.
It will be understood that many additional changes in the details, materials, steps and arrangement of parts, which have been herein described and illustrated to explain the nature of the invention, may be made by those skilled in the art within the principal and scope of the invention as expressed in the appended claims.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US6181286||Jul 22, 1999||Jan 30, 2001||Vistar Telecommunications Inc.||Integrated satellite/terrestrial antenna|
|US6211671||Nov 3, 1999||Apr 3, 2001||Genghiscomm Corporation||Interference-cancellation system for electromagnetic receivers|
|US6275196||Dec 5, 2000||Aug 14, 2001||Idigi Technologies, Inc.||Parabolic horn antenna for wireless high-speed internet access|
|US6907093||Aug 8, 2001||Jun 14, 2005||Viasat, Inc.||Method and apparatus for relayed communication using band-pass signals for self-interference cancellation|
|US6968171 *||Jun 4, 2002||Nov 22, 2005||Sierra Wireless, Inc.||Adaptive noise reduction system for a wireless receiver|
|US6992641||Oct 27, 2003||Jan 31, 2006||Cisco Technology, Inc.||Symmetry plane antenna system|
|US7084823||Feb 26, 2004||Aug 1, 2006||Skycross, Inc.||Integrated front end antenna|
|US20040227683||Feb 26, 2004||Nov 18, 2004||Caimi Frank M.||Integrated front end antenna|
|US20060270368||Jul 10, 2006||Nov 30, 2006||Caimi Frank M||Integrated Front End Antenna|
|US20070096919||Nov 3, 2005||May 3, 2007||Symbol Technologies, Inc.||Low return loss rugged RFID antenna|
|US20070117514||Nov 21, 2006||May 24, 2007||Widefi, Inc.||Directional antenna configuration for TDD repeater|
|US20100197231 *||Feb 3, 2009||Aug 5, 2010||Peter Kenington||Method and apparatus for interference cancellation|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US8060028 *||May 7, 2009||Nov 15, 2011||The United States Of America As Represented By The Secretary Of The Navy||Multi-spectrum high data rate communications system with electromagnetic interference cancellation|
|US8730786 *||Dec 21, 2010||May 20, 2014||Dali Systems Co. Ltd.||Remote radio head unit system with wideband power amplifier and method|
|US9106453||Apr 9, 2014||Aug 11, 2015||Dali Systems Co. Ltd.||Remote radio head unit system with wideband power amplifier and method|
|US20110158081 *||Dec 21, 2010||Jun 30, 2011||Dali Systems Ltd.||Remote radio head unit system with wideband power amplifier and method|
|CN102769499A *||Jul 26, 2012||Nov 7, 2012||南京华士电子科技有限公司||Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system|
|CN102769499B||Jul 26, 2012||Jun 4, 2014||南京华士电子科技有限公司||Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system|
|WO2014151055A1 *||Mar 12, 2014||Sep 25, 2014||Qualcomm Incorporated||Full-duplex wireless transceiver with hybrid circuit and reconfigurable radiation pattern antenna|
|Cooperative Classification||H04B1/126, H04B1/525|
|European Classification||H04B1/52L, H04B1/12A2|
|Feb 20, 2009||AS||Assignment|
Owner name: UNITED STATES OF AMERICA AS REPRESENTED BY THE SEC
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HO, THINH Q;HART, STEPHEN M;SIGNING DATES FROM 20081223 TO 20090208;REEL/FRAME:022289/0330
|Apr 17, 2015||REMI||Maintenance fee reminder mailed|
|Sep 6, 2015||LAPS||Lapse for failure to pay maintenance fees|
|Oct 27, 2015||FP||Expired due to failure to pay maintenance fee|
Effective date: 20150906